This protocol addresses the specific clinical scenario of an atypical cartilaginous tumour (ACT) arising in the appendicular skeleton — a subset of chondrosarcoma with a distinct WHO classification and a dedicated management pathway.
The WHO classifies these lesions as atypical cartilaginous tumours when they occur in the appendicular skeleton, distinguishing them from grade 1 chondrosarcoma, which applies to axial sites such as the scapula, pelvis, and skull. This site-based classification directly determines how the condition is approached clinically.
For ACTs in the extremities, the initial management strategy takes a conservative direction. The complete clinical decision pathway — including the full scope of the approach and the conditions under which it applies — is detailed in the structured protocol below.
DOI: 10.1038/s41416-024-02868-4
The WHO classifies these as atypical cartilaginous tumours in the appendicular skeleton, and grade 1 chondrosarcoma in the axial skeleton (including scapula, pelvis and skull).
In the extremity ACTs can be managed by observation initially.
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